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it doesnt matter how long u leave the block heater plugged in. i plug in when i am done driving for the day. the longer the heater is plugged in the warmer the engine is when u start it

Block heaters are a huge draw on electricity. If you are plugging it in regularily, you can save yourself a ton of money by adding a timer. 2 or 3 hours is more than emough to start any light duty diesel in any weather. If it is having trouble starting after 3 hrs, the engine has issues.

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Q: How long should you left the engine block heater on your ford F-250 plugged in?
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